/*
 * Copyright (C) 2017 Piotr Wittchen
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.pwittchen.reactivenetwork.library.rx2;

/**
 * Preconditions
 */
public final class Preconditions {
    private Preconditions() {
    }

    /**
     * Validation method, which checks if an object is null
     *
     * @param object to verify
     * @param message to be thrown in exception
     */
    public static void checkNotNull(Object object, String message) {
        if (object == null) {
            throw new IllegalArgumentException(message);
        }
    }

    /**
     * Validation method, which checks if a string is null or empty.
     *
     * @param string to verify
     * @param message to be thrown in exception
     */
    public static void checkNotNullOrEmpty(String string, String message) {
        if (string == null || string.isEmpty()) {
            throw new IllegalArgumentException(message);
        }
    }

    /**
     * Validation method, which checks is an integer number is positive
     *
     * @param number integer to verify
     * @param message to be thrown in exception
     */
    public static void checkGreaterOrEqualToZero(int number, String message) {
        if (number < 0) {
            throw new IllegalArgumentException(message);
        }
    }

    /**
     * Validation method, which checks is an integer number is non-zero or positive
     *
     * @param number integer to verify
     * @param message to be thrown in exception
     */
    public static void checkGreaterThanZero(int number, String message) {
        if (number <= 0) {
            throw new IllegalArgumentException(message);
        }
    }
}
